A 30-year-old woman was arrested on suspicion of possessing a Class A drug with intent to supply, a 44-year-old woman was held on suspicion of production of cannabis and a 23-year-old woman was arrested on suspicion of handling stolen goods.

In addition, a 50-year-old woman and a 28-year-old man were arrested on suspicion of money laundering. All remain in police custody awaiting interview.

Police say all those arrested were related.

Mobile phones, police jackets, bicycles and other suspected stolen goods were also discovered in the operation, as was a small quantity of cocaine.

Police say the total value of property owned by the family was £2.5m.

Chief Insp Steve Kendall said: "In time we will be looking to seize assets under the Proceeds of Crime Acts."